The Liberal Democrat leader, Tim Farron, has accused the Conservatives of calling an election for no other reason than to capitalise on Labour's weakness under Jeremy Corbyn.
"That's why we will prove the establishment experts wrong and change the direction of this election - because the British people know that they are the true wealth creators, held back by a system rigged for the wealth extractors".
And some have suggested that Corbyn is part of the problem.
Polls give the Conservative Party a lead of around 20 percentage points, enough to potentially give her a parliamentary majority of more than 100 seats, but Mrs May yesterday said she was not complacent.
"I don't play by their rules, and if a Labour government is elected on the 8th of June we won't play by their rules either", he said.
The decision by Great Britain's Prime Minister to call snap elections for June 8, 2017 was widely interpreted as an attempt by the ruling Conservatives to take advantage of the Labour Party's weakened state.
He said Thursday that the election was about "what kind of country we want to have after Brexit". He said that that he wanted a "framework" deal on Britain's exit from the European Union to be settled before the end of 2017, allowing negotiations to begin on the future relationship "immediately after".
Isner records upset of Wawrinka in Rome
The Austrian fought off a double match point at 4-6 in the tiebreaker, then thwarted a third match point at 6-7 before surviving. In the women s tournament, Venus Williams overcame determined Briton Johanna Konta to win their third-round clash 6-1, 3-6, 6-1.
The leader's position hadn't been that clear earlier in the day.
However, Corbyn refused to say whether there would be a pledge for a second Brexit referendum in Labour's forthcoming manifesto, in response to journalists' questions following his speech. This election is a chance for them to change direction of the country.
The seat with the narrowest Labour majority is Halifax where the Conservatives finished just 428 votes behind Labour in the 2015 General Election.
"We have a government that is far too ready to negotiate with very big companies about the level of tax they will pay".
"A second referendum is not our policy and it won't be in our manifesto", the spokesperson confirmed. The European Parliament will have to approve any deal agreed between Britain and the 27-member EU.
When asked what their plan is for Brexit, Labour quite simply have no answers for the British people, only soundbites that may roll off the tongue easily but don't give real answers to the real issues on Brexit that people care about.
Leaving Downing Street after talks lasting 45 minutes, Mr Tajani said he and Mrs May were agreed on the need for a resolution to the issue of United Kingdom and European Union ex-pats' rights.